The gp has to prove a counter factual now: no one else had symptoms.
They can’t do that. Do you know the history of all the move outs of that complex? Do you doubt the owner is highly litigious?
In addition, some people are just more sensitive. They act like a form of early warning system. Does living there give you an increased 10% of lifetime cancer? It would be hard to prove.
And a final note: doesn’t everyone deserve a safe place to live that isn’t poisoning them? The sheer amount of naysaying in these comments is disappointing and reveals a profound lack of understanding of the science and a severely over constrained mindset: if it cannot be proven immediately by an individual without a budget and no resources, then it cannot be true.